The OceanStor Dorado all-flash array is specifically engineered for ultra-low latency and high performance. Its No-Wait architecture eliminates processing delays, and its active-active controller design ensures data availability and persistence during a controller failure, which is critical for the financial trading scenario described. The other options either prioritize throughput over latency, introduce tiering latency, or lack the required high-availability features.

A backend disk bottleneck is characterized by front-end I/O requests waiting for the slower physical disks to complete operations. Key indicators are long front-end response times paired with high backend disk I/O wait times and high disk utilization (e.g., >70%). This shows that requests are queuing at the disk level. A high cache hit ratio (A) suggests data is being served from fast cache, avoiding disks. Low CPU (C) isn’t directly related to a disk bottleneck. A spike in IOPS with more cache use (D) is a normal cache function and doesn’t inherently point to a disk problem.

SMART attributes monitor the internal health of drives. An ‘Abnormal’ status is a strong predictive indicator of imminent failure. Huawei best practices dictate proactive replacement to avoid a double disk failure scenario that could compromise the RAID group. The storage system’s HotSpare and RAID protection are designed for this workflow: you proactively replace the predicted-failure drive, the system rebuilds data onto the new drive seamlessly, maintaining protection. Ignoring the alert (A) risks actual failure. Powering down (B) is an extreme and unnecessary action. Waiting for a maintenance window (C) introduces unnecessary risk.

HyperSnap is Huawei’s snapshot technology. It creates a point-in-time, read-only copy of a LUN that is initially space-efficient because it only records data changes (copy-on-write). This is perfect for creating a test copy for developers: it’s quick, consumes minimal extra space, and leaves the original production LUN untouched and performant. SmartThin (A) saves space initially but doesn’t create a copy. HyperClone (B) creates a full, immediate physical duplicate, which is space-intensive and slower. SmartMigration (D) moves data, it does not create a copy.

For any block-based replication technology, including HyperReplication, a basic prerequisite is that the target LUN must have adequate capacity to hold the data from the source LUN. It is typically recommended to be the same size or larger. The source and target LUNs are on different systems (local or remote), contradicting option A. HyperReplication supports both FC and iSCSI/IP networks (C). While low latency is crucial for performance and RPO, there is no universal sub-1ms hard limit for functionality (D); the technology works across longer distances with higher latency, though the recovery point objective (RPO) will be affected.

Deduplication and compression are compute-intensive processes. While they save significant space, they work by analyzing and modifying data in real-time or post-process, which consumes controller CPU and memory resources. On an extremely latency-sensitive LUN (like a high-performance database), this added overhead *can* lead to a slight increase in I/O latency. It’s a classic trade-off between efficiency and performance. The features reduce logical, not physical, capacity (A). They can typically be enabled on-the-fly (B). They can also be disabled if necessary (D), though this may require a data reorganization.

LUN Masking is a fundamental storage security and zoning technique. It works at the storage system level to restrict which host WWPNs (World Wide Port Names) or initiators are allowed to see and connect to specific LUNs. This prevents a server that is physically connected to the storage network from accessing storage volumes it is not authorized to use. Disk encryption (A) is a separate feature. Secure replication tunnels (C) are handled by protocols like IPsec. Hiding bad sectors (D) is a function of the disk drive and RAID controller, not LUN masking.

A major advantage of NAS-based snapshots is user-visible, self-service recovery. When configured, the storage system presents a read-only directory (commonly named ‘.snapshot’ or ‘~snapshot’) within the shared folder. Users with appropriate permissions can browse this directory, see snapshots taken at different times, and copy files or folders back to the live area. This empowers users and offloads simple recovery tasks from IT staff. Restoring from tape (A) is slow and requires admin intervention. HyperReplication (C) is for disaster recovery, not single-file recovery. Stating snapshots are only for storage rollbacks (D) is incorrect for NAS implementations.

Huawei SmartKit (formerly called Toolkit) is a standalone PC-based application designed for device maintenance, including information collection. Its ‘Health Check’ and ‘Information Collection’ features can gather a comprehensive set of logs, configuration files, and performance data from the storage system, which can then be analyzed locally or sent to Huawei support for diagnostics. DeviceManager (A) is the embedded web-based management interface for daily operations. eService (B) is the automated cloud connection for proactive support. OceanStor Toolkit (C) is a distractor; the correct current name is SmartKit.

The OceanStor Dorado all-flash array is specifically engineered for ultra-low latency and high performance. Its No-Wait architecture eliminates processing delays, and its active-active controller design ensures data availability and persistence during a controller failure, which is critical for the financial trading scenario described. The other options either prioritize throughput over latency, introduce tiering latency, or lack the required high-availability features.0